Instruction Manual Dräger P7-TDX
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10.2 Selection of the LPG pipeline test
The following tests can be selected:
Tightness 150 hPa (mbar)
= start of the automatic tightness test
Tightness 150 hPa (mbar) ext. pump
= start of the tightness test with external pump
Strength test 0.1 MPa (1 bar) 10 min = start of a strength test on LPG pipelines
Strength test 0.1 MPa (1 bar) 30 min
= start of a strength test on partially underground
LPG pipelines
10.3 Fully automatic tightness test according to TRF
Connect measuring device and LPG pipeline and start meas-
urement. The current pressure (P) and the elapsed pump
time (t) are shown.
After reaching the test pressure, the stabilization for tempera-
ture equalization is automatically started.
The duration of the stabilization phase is 10 minutes.
A test time of 10 minutes is required for the subsequent
automatic measurement.
The remaining sequence of a tightness test is described in Chapter 13.1. on page 33.
10.4 Tightness test with external pump according to TRF
The flow rate of the P7-TDX pump is approx. 1 l/min. The pressure increase to 100 hPa
(mbar) for a gas pipeline volume of 150 l takes longer than 15 min. Therefore, it makes
sense to work with an external pump, to shorten the time for pressure increase.
After starting the tightness test and connecting the LPG pipe-
line to the measuring device, the pressure in the line must be
increased.
Connect the external pump to the LPG pipeline using a valve
and increase the pressure.
The 10-minute stabilization phase begins using (
OK
).
A test time of 10 minutes is required for the measurement.
The remaining sequence of a tightness test is described in Chapter 13.1. on page 33.
